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unknown
Heat and freshwater transport through the central Labrador Sea
Authors
Clarke
Cuny
+33 more
Dickson
Eden
F. Straneo
Gent
Houghton
Ikeda
Jones
Katsman
Khatiwala
Khatiwala
Kieke
Kuhlbrodt
Lab Sea Group
Lavender
Lavender
Lazier
Lazier
Lazier
Legg
Lilly
Lilly
Moore
Pickart
Prater
Renfrew
Rhein
Sathiyamoorthy
Smith
Spall
Spall
Straneo
Tucker
Visbeck
Publication date
1 April 2006
Publisher
'American Meteorological Society'
Doi
Cite
Abstract
Author Posting. © American Meteorological Society, 2006. This article is posted here by permission of American Meteorological Society for personal use, not for redistribution. The definitive version was published in Journal of Physical Oceanography 36 (2006): 606-628, doi:10.1175/JPO2875.1.The seasonal and interannual variations in the export of Labrador Sea Water (LSW), and in the heat and freshwater transport through the central Labrador Sea, are examined for two different periods: from 1964 to 1974, using Ocean Weather Station Bravo data, and from 1996 to 2000, using data collected from profiling floats. A typical seasonal cycle involves a 300-m thickening of LSW (convection) followed by an equivalent thinning (restratification). Restratification is characterized by a drift of properties toward boundary current values that is indicative of a vigorous lateral exchange. The net result is a convergence of heat and salt, between 200 and 700 m, that balances the net surface heat loss to the atmosphere and partially offsets the surface freshwater accumulation due to surface, lateral exchange. Interannual variations in the export of LSW can be explained by taking into account changes in the central Labrador Sea–boundary current density gradient, which governs the lateral exchange. Interannual variations in how much heat is converged into the region, on the other hand, mostly reflect changes in the temperature of LSW. This only partly explains, however, the increased convergence of heat that occurs during the late 1990s. In years in which convection does not occur, restratification trends continue throughout the entire year, albeit at a reduced rate.This work was supported by NSF Grant OCE 02-40978, the John E. and Anne W. Sawyer Endowed Fund, and the Grayce B. Kerr Fund
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